My 388 Tonawanda block is 4 bolt also. Tonawanda did not have the machines needed to produce 2.02" intake valved heads, so they did not produce any 302 engines (at least that I have ever heard of). John Z or Kurt correct me if I am misinformed.

My 388 Tonawanda block is 4 bolt also. Tonawanda did not have the machines needed to produce 2.02" intake valved heads, so they did not produce any 302 engines (at least that I have ever heard of). John Z or Kurt correct me if I am misinformed.

boston14

Could you explain this. All it takes is a different fly cutter to put in seats. The guides were the same size. The castings were basically the same in configuration.

My 388 Tonawanda block is 4 bolt also. Tonawanda did not have the machines needed to produce 2.02" intake valved heads, so they did not produce any 302 engines (at least that I have ever heard of). John Z or Kurt correct me if I am misinformed.

boston14

This issue was discussed several years ago. I recall a few orig 302's built with the 388 block.

<<Could you explain this. All it takes is a different fly cutter to put in seats. The guides were the same size. The castings were basically the same in configuration.>>

Photo below is a 461 chamber with 2.02/1.6 valves, but it's similar to the 462/291/186 chamber; note the added machining cut to unshroud the side of the chamber wall adjacent to the intake valve to optimize flow. Tonawanda only built small-block heads with 1.94/1.5 valves and no unshrouding cut, and didn't build any solid-lifter small-blocks; all solid-lifter small-blocks (and hydraulic-lifter L-79's) used 2.02/1.6-valves, and they were built only at Flint V-8. Flint had the transfer line station for the larger valves and the unshrouding cut, and Tonawanda didn't.